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JAEA Reports

Preliminary 3-dimensional analysis of groundwater flow in the surrounding environment of near surface disposal facility

Sakai, Akihiro; Kurosawa, Ryohei*; Totsuka, Masayoshi; Nakata, Hisakazu; Amazawa, Hiroya

JAEA-Technology 2016-032, 117 Pages, 2017/02

JAEA-Technology-2016-032.pdf:12.84MB

JAEA has been planning to implement near surface disposal of low level waste generated from research, medical, and industrial facilities. JAEA plans to carry out 3d analysis of groundwater flow in geological model around the disposal site because of development of migration assessment modeling of radioactivity materials in the site. In the safety demonstration test in JAEA, 3d analysis of groundwater flow was carried out on 1999. The analysis was calculated by using the code "3D-SEEP". But it is necessary to improve the conditions of the model in the analysis. Therefore, we improved the geological model which had been developed carried out 3d analysis of groundwater flow by using the current 3D-SEEP for the specified disposal site in the future. From the result, we expect that 3d analysis of groundwater flow in the environment around the specified near surface disposal site will be able to be sufficiently conducted by developing an appropriate model for the disposal site.

JAEA Reports

Method and result for calculation of radioactivity concentration of radionuclide corresponding to dose criterion for near surface disposal of radioactive waste generated from research, medical, and industrial facilities

Okada, Shota; Kurosawa, Ryohei; Sakai, Akihiro; Nakata, Hisakazu; Amazawa, Hiroya

JAEA-Technology 2015-016, 44 Pages, 2015/07

JAEA-Technology-2015-016.pdf:5.8MB

In this report, we calculated radioactivity concentration of radionuclides potentially contained in low level radioactive waste (LLW) generated from research, medical, and industrial facilities corresponding to dose criterion (10 $$mu$$Sv/y) for near surface disposal. 220 kinds of nuclides whose half-life are more than 30 days were selected. Radioactivity concentrations corresponding to dose criterion of 40 nuclides among 220 ones were calculated by using the representative model because the concentrations of 40 nuclides had not been calculated yet. Skyshine dose from each of 19 nuclides, whose radioactivity concentration were invalid values that are larger than the specific radioactivity of nuclides, during operation of disposal facility was calculated. These radioactivity concentrations can be used as criteria of categorization of LLW between trench type and concrete vault type disposal and of preliminary selection of important nuclides of these disposals in the generic conditions.

Journal Articles

Sorption and migration of neptunium in porous sedimentary materials

Tanaka, Tadao; Mukai, Masayuki; Nakayama, Shinichi

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

no abstracts in English

Journal Articles

Estimates of parameter and scenario uncertainties in shallow-land disposal of uranium wastes using deterministic and probabilistic safety assessment models

Takeda, Seiji; Kanno, Mitsuhiro; Minase, Naofumi; Kimura, Hideo

Journal of Nuclear Science and Technology, 39(8), p.929 - 937, 2002/08

no abstracts in English

Journal Articles

Safety assessment of uranium waste disposal

Kimura, Hideo

Genshiryoku Bakkuendo Kenkyu, 8(2), p.103 - 114, 2002/03

no abstracts in English

Journal Articles

Measurement of distribution coefficients of U series radionuclides on soils under shallow land environment, 2; pH dependence of distribution coefficients

Sakamoto, Yoshiaki; Ishii, Tomoaki*; Inagawa, Satoshi*; Gunji, Yasuyoshi*; Takebe, Shinichi; Ogawa, Hiromichi; Sasaki, Tomozo*

Genshiryoku Bakkuendo Kenkyu, 8(1), p.65 - 76, 2001/09

In order to study adsorption behavior of U series radionuclides(Pb, Ra, Th, Ac, Pa and U) in aerated zone environment (loam-rein water system) and aquifer environment(sand-groundwater system) for safety assessment of U bearing waste), pH dependence of distribution coefficients of each element have been obtained. The pH dependence of distribution coefficients of U, Ac, Th, Ra and Pb was analyzed by model calculation of adsorption behavior based on chemical forms of each elements and soil surface characteristics, which are a cation exchange capacity and surface charge. From model calculation of adsorption behavior, the distribution coefficients' values and adsorption behavior of Pb, Ra, Th, Ac and U could be showed by a combination of cation exchange and surface-complexation adsorption model.

Journal Articles

Measurement of distribution coefficients for uranium series radionuclides under shallow land environment condition, 1

Ishii, Tomoaki*; Inagawa, Satoshi*; Gunji, Yasuyoshi*; Sakamoto, Yoshiaki; Takebe, Shinichi; Ogawa, Hiromichi; Sasaki, Tomozo*

Genshiryoku Bakkuendo Kenkyu, 8(1), p.55 - 64, 2001/09

Distribution coefficients of Uranium series nuclide(Pb,Ra,Ac,Th,Pa and U) were obtained under aerated zone environment and aquifer environment, for the safety evaluation of shallow underground disposal of uranium bearing waste. The distribution coefficients of them on 4 kinds of soil such as the loam in the rain water as for aerated zone environment and on 3 kinds of soil and rock such as the sand in groundwater as for aquifer environment have been measured by batch method. The distribution coefficients in aerated zone environment were one or two orders in magnitude higher than that in aquifer environment, except Ac. And, there was approximately the linear correlation on the relationship between cation exchange capacity and specific surface area, which are representative physical property of the soil, and distribution coefficient of lead, radium and protactinium.

JAEA Reports

Conceptual designs of near surface disposal facility for radioactive waste arising from the facilities using radioisotopes and research facilities for nuclear energy development and utilization

Sakai, Akihiro; Yoshimori, Michiro; Okoshi, Minoru; Yamamoto, Tadatoshi; Abe, Masayoshi

JAERI-Tech 2001-018, 88 Pages, 2001/03

JAERI-Tech-2001-018.pdf:5.66MB

no abstracts in English

Journal Articles

Safety analyses of shallow-land disposal of uranium waste

Kimura, Hideo

KURRI-KR-56, p.95 - 108, 2001/03

no abstracts in English

Journal Articles

Overview and present status of the IAEA/RADWASS programme

Abe, Masayoshi

Dekomisshoningu Giho, (18), p.2 - 16, 1998/08

no abstracts in English

Journal Articles

Current studies on the decommissioning materials recycling at Japan Atomic Energy Research Institute

Fujiki, Kazuo; Nakamura, Hisashi

Proc. of the 1993 Int. Conf. on Nuclear Waste Management and Environmental Remediation,Vol. 3, p.321 - 327, 1993/00

no abstracts in English

Journal Articles

Problems in tests for performance evaluation of natural barrier to radionuclide migration in the shallow land

Kamiyama, Hideo

KURRI-TR-349, p.16 - 22, 1991/00

no abstracts in English

Journal Articles

Environmental simulation test for radionuclide migration in soil layer

Kagaku To Kogyo, 42(7), p.1240 - 1241, 1989/00

no abstracts in English

Journal Articles

Radionuclide migration test using undisturbed aerated soil sample

Yamamoto, Tadatoshi; ; Ogawa, Hiromichi;

Nippon Genshiryoku Gakkai-Shi, 30(10), p.942 - 949, 1988/10

 Times Cited Count:5 Percentile:46.37(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Development of confirmation methods of waste packages to radioactive wastes generated from research facilities, 1; Development plan for confirmation methods of waste packages for near surface disposal

Izumo, Sari; Hayashi, Hirokazu; Nakata, Hisakazu; Kameo, Yutaka; Amazawa, Hiroya; Sakai, Akihiro

no journal, , 

no abstracts in English

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